chore(deps): Updated to Theia 1.39.0 (#2144)

- update Theia to `1.39.0`,
 - remove the application packager and fix the security vulnerabilities,
 - bundle the backed application with `webpack`, and
 - enhance the developer docs.

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/dialogs/settings/settings-component.tsx

@@ -1,4 +1,4 @@
-import * as React from '@theia/core/shared/react';
+import React from '@theia/core/shared/react';
 import { Tab, Tabs, TabList, TabPanel } from 'react-tabs';
 import 'react-tabs/style/react-tabs.css';
 import { Disable } from 'react-disable';